atheist
n. countable B2 Upper Intermediate US //ˈeɪθiəst// UK //ˈeɪθɪˌɪst// athe·ist
n. a person who does not believe that any gods exist.
n. a person who disbelieves or lacks belief in the existence of God or gods.
He is an atheist and does not go to church on Sundays.
As an atheist, she prefers secular wedding ceremonies that focus on human connection rather than religious traditions.
The author identifies as a pragmatic atheist, arguing that morality must be grounded in human well-being and social cooperation rather than divine command.
From Middle French athéiste (athée + -iste), from Latin atheos, from Ancient Greek ἄθεος (átheos, “godless, without god”), from ἀ- (a-, “without”) + θεός (theós, “god”).
Usage
Frequently used attributively to modify other nouns, though 'atheistic' is the dedicated adjective.